the JOIN cirlce in the PVP battles BROKEN???

it seems you can only Quick join a battle or make one with your friends , but why when i see lets say a 3v3 battle and one person's name and then 2 JOIN buttons after , yet they are grayed out and clicking on them does nothing. Is this a BUG , Broken? Is it supposed to be like that? i don't like it!

I personally assumed this was the level limits on the match. If a person that's level 10 starts a match, the system should keep the match within a few levels of the creator's level. This way a level 50 can't come in and dominate the match.

plz don't scream. okay want to know why those buttons are grey. its cause you have to quick join. also a reason why its grey is cause they have to be your friends. if they are your friends go to the right and click on the button that looks like a hand shake. the button should say team up with friends. click on that and now the grey buttons become green.